Hard-wearing and flexible, the Hillman #66 Spring For Extension is the optimal choice if your are looking for an extension spring that lasts long. Made from robust steel, this spring has a zinc coated finish that improves the look of the spring, if used outdoors. With long round ends, this spring is easy to set up.Features Long round ends Steel ring coated with zinc Withstands substantial amounts of tension Specifications Outer Diameter:15/32" Wire Size:0.047" Finish:Zinc Plated Spring Number:#66 Type: Extension Spring Application: Tools and Home Improvement Length: 3-5/16" and 6-3/4" OAL Color: Gray